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        // 一个条件为false结果为false
        console.log(10 > 5 && 10 > 6);
        console.log(10 < 5 && 10 > 6);

        // 一个条件为true结果为true
        console.log(10 > 5 || 10 > 6);
        console.log(10 < 5 || 10 > 6);

        // 取反
        console.log(!true);
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